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3 years ago

Evaluate the expression for the with the values of a=1/2 and b=3/4. 20a −(4b+5) +?

Mathematics

1 answer:

Dima020 [189]3 years ago

5 0

answer is 4

i used calculator

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Use the quadratic formula to solve the equation.

elena-14-01-66 [18.8K]

Answer:

$\large\boxed{x=\dfrac{5-\sqrt5}{4},\ x=\dfrac{5+\sqrt5}{4}}$

Step-by-step explanation:

$\text{The quadratic formula for}\ ax^2+bx+c=0\\\\\text{if}\ b^2-4ac$

$\text{We have the equation:}\ 4x^2-10x+5=0\\\\a=4,\ b=-10,\ c=5\\\\b^2-4ac=(-10)^2-4(4)(5)=100-80=20>0\\\\x=\dfrac{-(-10)\pm\sqrt{20}}{2(4)}=\dfrac{10\pm\sqrt{4\cdot5}}{8}=\dfrac{10\pm\sqrt4\cdot\sqrt5}{8}=\dfrac{10\pm2\sqrt5}{8}\\\\=\dfrac{2(5\pm\sqrt5)}{8}=\dfrac{5\pm\sqrt5}{4}$

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3 years ago

Dina took 12 hours to read a 600 page book What was her page per minute rate?

jok3333 [9.3K]

50 divide to find the answer

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3 years ago

If you can exchange 104.51 US dollars for 1,322.14 Mexican pesos, what is the exchange rate of the US dollar to the Mexican peso

Thepotemich [5.8K]

Given:
USD: 104.51
Mexican pesos: 1,322.14

1,322.14 / 104.51 = 12.65

1 US Dollar is equal to 12.65 Mexican Pesos

or

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1 Mexican peso is equal to 0.079 US Dollars.

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3 years ago

Find the area of a circular pond having radius Ans: 616 m 14 m.

krek1111 [17]

Step-by-step explanation:

Area of circular pond=22/7×14×14

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2 years ago

What is the approximate length of minor arc XZ

Yakvenalex [24]

Answer:

3.7

Step-by-step explanation:

2r(pi)(∅/360)

2*3*(pi)*(70/360)

6*(pi)*(0.19444...)

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3.7

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3 years ago